Three sisters (Prue, Piper and Phoebe) reunite and unlock their powers to become the Charmed Ones, the most powerful good witches of all time, whose prophesied destiny is to protect innocent lives from evil beings such as demons and warlocks. Each sister possesses unique magical powers that grow and evolve, while they attempt to maintain normal lives in modern day San Francisco.

Steve Deakin teaches history and is a foot soldier in the Sealed Knot Society. In a fortnight between two English Civil War battles he finds he faces challenges, both personal and professional.